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Apparatus for detecting impurities in material and detecting method therefor

a technology for impurities and detecting devices, applied in the direction of optical radiation measurement, instruments, tobacco, etc., can solve the problems of hard to detect impurities and cannot be detected practically, and achieve the effect of accurately detecting impurities in other bulk materials and accurately detecting impurities in materials

Inactive Publication Date: 2007-06-05
JAPAN TOBACCO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]One object of the present invention is to provide a detecting apparatus and a method capable of accurately detecting impurities in a material without regard to differences in color between the material consisting of tobacco leaves and a plurality of kinds of impurities. A second object of the present invention is to provide a detecting apparatus and a method capable of accurately detecting impurities of other bulk materials made from harvest plants.
[0020]In the case where infrared rays are used as the detection light, the infrared rays heat the material. In the case where only the specific wavelength components of the infrared rays are applied to the material, however, the material receives little thermal energy, so that the material can be prevented from overheating. In consequence, there is no possibility of the material drying excessively during the detection of the impurities, so that the quality of the material can be maintained.
[0021]Preferably, the illuminating device further includes cooling means for cooling the source of generation of the infrared rays. In this case, heat release from the illuminating device can be reduced.

Problems solved by technology

If the impurities have the same or similar colors as the tobacco leaves, therefore, they cannot be detected practically.
In the case where the material include tobacco leaves of different varieties, in particular, therefore, it is very hard to detect impurities in them.

Method used

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  • Apparatus for detecting impurities in material and detecting method therefor
  • Apparatus for detecting impurities in material and detecting method therefor
  • Apparatus for detecting impurities in material and detecting method therefor

Examples

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example # 1

EXAMPLE #1

[0041]The following is a description of the reason why the aforesaid first to third reflection components are selected.

[0042]In FIG. 2, full lines T1, T2, T3, and T4 represent the reflection characteristics of infrared spectra reflected by the domestic, barley, oriental, and yellow varieties, respectively.

[0043]In FIG. 2, on the other hand, broken line A, dashed line B, and two-dot chain line C represent the reflection characteristics of infrared spectra reflected by various impurities, individually. More specifically, the reflection characteristics A, B and C are obtained from a plastic material, such as a wrapper of string, used to pack tobacco leaves, urethane foam that forms a package, and moisture-proof paper used to line the package, respectively. Further, a reflection characteristic D indicated by three-dot chain line in FIG. 2 is obtained from black synthetic rubber that forms a belt of the conveyor 2.

[0044]As seen from FIG. 2, the reflection characteristics T1, T2...

example # 2

EXAMPLE #2

[0081]The detecting apparatus and method for detecting impurities is not limited to use with tobacco leaves as described above. Next another example of the detecting apparatus and a method capable of accurately detecting impurities in other materials will be described. In this second example the materials are made from harvest plants in bulk.

[0082]FIG. 10 describes Example #2 and illustrates the first wavelength region from which the first wavelength component is selected and the second wavelength region from which the second wavelength component is selected. The third wavelength component can be selected from the first or the second wavelength region.

[0083]Various materials made from harvest plants all include water which absorbs predetermined wavelength components of infrared rays. Especially in case that one of the wavelength components has a wavelength of 1,940 nm, the specific wavelength component is significantly absorbed by the moisture content of the material.

[0084...

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Abstract

In an apparatus and a method for detecting impurities in a material, infrared rays or a plurality of specific wavelength components of the infrared rays are applied to a material on a conveyor, the respective reflection intensities of the specific wavelength components reflected by the material are measured, the measured reflection intensities and the reflection intensities of specific wavelength components inherent to the material are compared, and impurities in the material are detected according to the result of the comparison.

Description

[0001]This application is a continuation-in-part of U.S. application Ser. No. 10 / 005,076, filed on Dec. 7, 2001 now U.S. Pat. No. 6,614,531, which is a continuation of International Application No. PCT / JP00 / 03669, filed Jun. 6, 2000, which designated the United States, the entire disclosures of which are hereby incorporated by reference and for which priority is claimed under 35 U.S.C. §120.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an impurity detecting apparatus for efficiently detecting various foreign substances or impurities in a material and a detecting method therefore.[0004]2. Description of Background Art[0005]Tobacco leaves, a harvest, are packed in various forms as they are carried into tobacco material plants or cigarette manufacturing plants. After they are unpacked in these plants, the tobacco leaves are separated according to their varieties or mixed with other varieties. In this state, they are transported as the ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G01N21/85A24B1/04B07C5/342G01N21/35G01N21/88
CPCA24B1/04B07C5/342G01N21/359G01N21/85G01N21/8806G01N21/3563
Inventor SATO, KIYOMIFUTAMURA, TSUYOSHIKIDA, SHINZO
Owner JAPAN TOBACCO INC
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